#!/usr/bin/env python

# this is a base set of waf rules that everything else pulls in first

import os, sys
from waflib import Configure, Logs, Options, Utils, Context, Errors
import wafsamba
from samba_utils import symlink
from optparse import SUPPRESS_HELP

# this forces configure to be re-run if any of the configure
# sections of the build scripts change. We have to check
# for this in sys.argv as options have not yet been parsed when
# we need to set this. This is off by default until some issues
# are resolved related to WAFCACHE. It will need a lot of testing
# before it is enabled by default.
if '--enable-auto-reconfigure' in sys.argv:
    Configure.autoconfig = 'clobber'

def default_value(option, default=''):
    if option in Options.options.__dict__:
        return Options.options.__dict__[option]
    return default

def options(opt):
    opt.load('compiler_cc')

    opt.load('gnu_dirs')

    gr = opt.option_group('library handling options')

    gr.add_option('--bundled-libraries',
                   help=("comma separated list of bundled libraries. May include !LIBNAME to disable bundling a library. Can be 'NONE' or 'ALL' [auto]"),
                   action="store", dest='BUNDLED_LIBS', default='')

    gr.add_option('--private-libraries',
                   help=("comma separated list of normally public libraries to build instead as private libraries. May include !LIBNAME to disable making a library private. Can be 'NONE' or 'ALL' [auto]"),
                   action="store", dest='PRIVATE_LIBS', default='')

    extension_default = default_value('PRIVATE_EXTENSION_DEFAULT')
    gr.add_option('--private-library-extension',
                   help=("name extension for private libraries [%s]" % extension_default),
                   action="store", dest='PRIVATE_EXTENSION', default=extension_default)

    extension_exception = default_value('PRIVATE_EXTENSION_EXCEPTION')
    gr.add_option('--private-extension-exception',
                   help=("comma separated list of libraries to not apply extension to [%s]" % extension_exception),
                   action="store", dest='PRIVATE_EXTENSION_EXCEPTION', default=extension_exception)

    builtin_default = default_value('BUILTIN_LIBRARIES_DEFAULT')
    gr.add_option('--builtin-libraries',
                   help=("command separated list of libraries to build directly into binaries [%s]" % builtin_default),
                   action="store", dest='BUILTIN_LIBRARIES', default=builtin_default)

    gr.add_option('--minimum-library-version',
                   help=("list of minimum system library versions (LIBNAME1:version,LIBNAME2:version)"),
                   action="store", dest='MINIMUM_LIBRARY_VERSION', default='')

    gr.add_option('--disable-rpath',
                   help=("Disable use of rpath for build binaries"),
                   action="store_true", dest='disable_rpath_build', default=False)
    gr.add_option('--disable-rpath-install',
                   help=("Disable use of rpath for library path in installed files"),
                   action="store_true", dest='disable_rpath_install', default=False)
    gr.add_option('--disable-rpath-private-install',
                   help=("Disable use of rpath for private library path in installed files"),
                   action="store_true", dest='disable_rpath_private_install', default=False)
    gr.add_option('--nonshared-binary',
                   help=("Disable use of shared libs for the listed binaries"),
                   action="store", dest='NONSHARED_BINARIES', default='')
    gr.add_option('--disable-symbol-versions',
                   help=("Disable use of the --version-script linker option"),
                   action="store_true", dest='disable_symbol_versions', default=False)

    opt.add_option('--with-modulesdir',
                   help=("modules directory [PREFIX/modules]"),
                   action="store", dest='MODULESDIR', default='${PREFIX}/modules')

    opt.add_option('--with-privatelibdir',
                   help=("private library directory [PREFIX/lib/%s]" % Context.g_module.APPNAME),
                   action="store", dest='PRIVATELIBDIR', default=None)

    opt.add_option('--with-libiconv',
                   help='additional directory to search for libiconv',
                   action='store', dest='iconv_open', default='/usr/local',
                   match = ['Checking for library iconv', 'Checking for iconv_open', 'Checking for header iconv.h'])
    opt.add_option('--without-gettext',
                   help=("Disable use of gettext"),
                   action="store_true", dest='disable_gettext', default=False)

    gr = opt.option_group('developer options')

    gr.add_option('-C',
                   help='enable configure caching',
                   action='store_true', dest='enable_configure_cache')
    gr.add_option('--enable-auto-reconfigure',
                   help='enable automatic reconfigure on build',
                   action='store_true', dest='enable_auto_reconfigure')
    gr.add_option('--enable-debug',
                   help=("Turn on debugging symbols"),
                   action="store_true", dest='debug', default=False)
    gr.add_option('--enable-developer',
                   help=("Turn on developer warnings and debugging"),
                   action="store_true", dest='developer', default=False)
    gr.add_option('--disable-warnings-as-errors',
                   help=("Do not treat all warnings as errors (disable -Werror)"),
                   action="store_true", dest='disable_warnings_as_errors', default=False)
    opt.add_option('--enable-coverage',
                   help=("enable options necessary for code coverage "
                         "reporting on selftest (default=no)"),
                   action="store_true", dest='enable_coverage', default=False)
    gr.add_option('--fatal-errors',
                   help=("Stop compilation on first error (enable -Wfatal-errors)"),
                   action="store_true", dest='fatal_errors', default=False)
    gr.add_option('--enable-gccdeps',
                   help=("Enable use of gcc -MD dependency module"),
                   action="store_true", dest='enable_gccdeps', default=True)
    gr.add_option('--pedantic',
		   help=("Enable even more compiler warnings"),
		   action='store_true', dest='pedantic', default=False)
    gr.add_option('--git-local-changes',
		   help=("mark version with + if local git changes"),
		   action='store_true', dest='GIT_LOCAL_CHANGES', default=False)
    gr.add_option('--address-sanitizer',
                   help=("Enable address sanitizer compile and linker flags"),
                   action="store_true", dest='address_sanitizer', default=False)
    gr.add_option('--undefined-sanitizer',
        help=("Enable undefined behaviour sanitizer compile and linker flags"),
        action="store_true",
        dest='undefined_sanitizer',
        default=False)
    gr.add_option('--enable-libfuzzer',
                  help=("Build fuzzing binaries (requires compiler options for libFuzzer or compiler wrapper such as honggfuzz/hfuzz-cc)"),
                  action="store_true", dest='enable_libfuzzer', default=False)

    gr.add_option('--abi-check',
		   help=("Check ABI signatures for libraries"),
		   action='store_true', dest='ABI_CHECK', default=False)
    gr.add_option('--abi-check-disable',
		   help=("Disable ABI checking (used with --enable-developer)"),
		   action='store_true', dest='ABI_CHECK_DISABLE', default=False)
    gr.add_option('--abi-update',
		   help=("Update ABI signature files for libraries"),
		   action='store_true', dest='ABI_UPDATE', default=False)

    gr.add_option('--show-deps',
		   help=("Show dependency tree for the given target"),
		   dest='SHOWDEPS', default='')

    gr.add_option('--symbol-check',
                  help=("check symbols in object files against project rules"),
                  action='store_true', dest='SYMBOLCHECK', default=False)

    gr.add_option('--dup-symbol-check',
                  help=("check for duplicate symbols in object files and system libs (must be configured with --enable-developer)"),
                  action='store_true', dest='DUP_SYMBOLCHECK', default=False)

    gr.add_option('--why-needed',
                  help=("TARGET:DEPENDENCY check why TARGET needs DEPENDENCY"),
                  action='store', type='str', dest='WHYNEEDED', default=None)

    gr.add_option('--show-duplicates',
                  help=("Show objects which are included in multiple binaries or libraries"),
                  action='store_true', dest='SHOW_DUPLICATES', default=False)

    gr = opt.add_option_group('cross compilation options')

    gr.add_option('--cross-compile',
		   help=("configure for cross-compilation"),
		   action='store_true', dest='CROSS_COMPILE', default=False)
    gr.add_option('--cross-execute',
		   help=("command prefix to use for cross-execution in configure"),
		   action='store', dest='CROSS_EXECUTE', default='')
    gr.add_option('--cross-answers',
		   help=("answers to cross-compilation configuration (auto modified)"),
		   action='store', dest='CROSS_ANSWERS', default='')
    gr.add_option('--hostcc',
		   help=("set host compiler when cross compiling"),
		   action='store', dest='HOSTCC', default=False)

    # we use SUPPRESS_HELP for these, as they are ignored, and are there only
    # to allow existing RPM spec files to work
    opt.add_option('--build',
		   help=SUPPRESS_HELP,
		   action='store', dest='AUTOCONF_BUILD', default='')
    opt.add_option('--host',
		   help=SUPPRESS_HELP,
		   action='store', dest='AUTOCONF_HOST', default='')
    opt.add_option('--target',
		   help=SUPPRESS_HELP,
		   action='store', dest='AUTOCONF_TARGET', default='')
    opt.add_option('--program-prefix',
		   help=SUPPRESS_HELP,
		   action='store', dest='AUTOCONF_PROGRAM_PREFIX', default='')
    opt.add_option('--disable-dependency-tracking',
		   help=SUPPRESS_HELP,
		   action='store_true', dest='AUTOCONF_DISABLE_DEPENDENCY_TRACKING', default=False)
    opt.add_option('--disable-silent-rules',
		   help=SUPPRESS_HELP,
		   action='store_true', dest='AUTOCONF_DISABLE_SILENT_RULES', default=False)

    gr = opt.option_group('dist options')
    gr.add_option('--sign-release',
                   help='sign the release tarball created by waf dist',
                   action='store_true', dest='SIGN_RELEASE')
    gr.add_option('--tag',
                   help='tag release in git at the same time',
                   type='string', action='store', dest='TAG_RELEASE')

    opt.add_option('--disable-python',
                    help='do not generate python modules',
                    action='store_true', dest='disable_python', default=False)


@Utils.run_once
def configure(conf):
    conf.env.hlist = []
    conf.env.srcdir = conf.srcnode.abspath()

    conf.define('SRCDIR', conf.env['srcdir'])

    conf.SETUP_CONFIGURE_CACHE(Options.options.enable_configure_cache)

    # load our local waf extensions
    conf.load('gnu_dirs')
    conf.load('wafsamba')

    conf.CHECK_CC_ENV()

    conf.load('compiler_c')

    conf.CHECK_STANDARD_LIBPATH()

    # we need git for 'waf dist'
    conf.find_program('git', var='GIT')

    # older gcc versions (< 4.4) does not work with gccdeps, so we have to see if the .d file is generated
    if Options.options.enable_gccdeps:
        # stale file removal - the configuration may pick up the old .pyc file
        p = os.path.join(conf.env.srcdir, 'buildtools/wafsamba/gccdeps.pyc')
        if os.path.exists(p):
            os.remove(p)
        conf.load('gccdeps')

    # make the install paths available in environment
    conf.env.LIBDIR = Options.options.LIBDIR or '${PREFIX}/lib'
    conf.env.BINDIR = Options.options.BINDIR or '${PREFIX}/bin'
    conf.env.SBINDIR = Options.options.SBINDIR or '${PREFIX}/sbin'
    conf.env.MODULESDIR = Options.options.MODULESDIR
    conf.env.PRIVATELIBDIR = Options.options.PRIVATELIBDIR
    conf.env.BUNDLED_LIBS = Options.options.BUNDLED_LIBS.split(',')
    conf.env.SYSTEM_LIBS = ()
    conf.env.PRIVATE_LIBS = Options.options.PRIVATE_LIBS.split(',')
    conf.env.BUILTIN_LIBRARIES = Options.options.BUILTIN_LIBRARIES.split(',')
    conf.env.NONSHARED_BINARIES = Options.options.NONSHARED_BINARIES.split(',')

    conf.env.PRIVATE_EXTENSION = Options.options.PRIVATE_EXTENSION
    conf.env.PRIVATE_EXTENSION_EXCEPTION = Options.options.PRIVATE_EXTENSION_EXCEPTION.split(',')

    conf.env.CROSS_COMPILE = Options.options.CROSS_COMPILE
    conf.env.CROSS_EXECUTE = Options.options.CROSS_EXECUTE
    conf.env.CROSS_ANSWERS = Options.options.CROSS_ANSWERS
    conf.env.HOSTCC        = Options.options.HOSTCC

    conf.env.AUTOCONF_BUILD = Options.options.AUTOCONF_BUILD
    conf.env.AUTOCONF_HOST  = Options.options.AUTOCONF_HOST
    conf.env.AUTOCONF_PROGRAM_PREFIX = Options.options.AUTOCONF_PROGRAM_PREFIX

    conf.env.disable_python = Options.options.disable_python

    if (conf.env.AUTOCONF_HOST and
        conf.env.AUTOCONF_BUILD and
        conf.env.AUTOCONF_BUILD != conf.env.AUTOCONF_HOST):
        Logs.error('ERROR: Mismatch between --build and --host. Please use --cross-compile instead')
        sys.exit(1)
    if conf.env.AUTOCONF_PROGRAM_PREFIX:
        Logs.error('ERROR: --program-prefix not supported')
        sys.exit(1)

    # enable ABI checking for developers
    conf.env.ABI_CHECK = Options.options.ABI_CHECK or Options.options.developer
    if Options.options.ABI_CHECK_DISABLE:
        conf.env.ABI_CHECK = False
    try:
        conf.find_program('gdb', mandatory=True)
    except:
        conf.env.ABI_CHECK = False

    conf.env.enable_coverage = Options.options.enable_coverage
    if conf.env.enable_coverage:
        conf.ADD_LDFLAGS('-lgcov', testflags=True)
        conf.ADD_CFLAGS('--coverage', testflags=True)
        # disable abi check for coverage, otherwise ld will fail
        conf.env.ABI_CHECK = False

    conf.env.GIT_LOCAL_CHANGES = Options.options.GIT_LOCAL_CHANGES

    conf.CHECK_UNAME()

    # see if we can compile and run a simple C program
    conf.CHECK_CODE('printf("hello world")',
                    define='HAVE_SIMPLE_C_PROG',
                    mandatory=True,
                    execute=True,
                    headers='stdio.h',
                    msg='Checking simple C program')

    # Try to find the right extra flags for -Werror behaviour
    for f in ["-Werror",       # GCC
              "-errwarn=%all", # Sun Studio
              "-qhalt=w",     # IBM xlc
              "-w2",           # Tru64
             ]:
        if conf.CHECK_CFLAGS([f]):
            if not 'WERROR_CFLAGS' in conf.env:
                conf.env['WERROR_CFLAGS'] = []
            conf.env['WERROR_CFLAGS'].extend([f])
            break

    # check which compiler/linker flags are needed for rpath support
    if conf.CHECK_LDFLAGS(['-Wl,-rpath,.']):
        conf.env['RPATH_ST'] = '-Wl,-rpath,%s'
    elif conf.CHECK_LDFLAGS(['-Wl,-R,.']):
        conf.env['RPATH_ST'] = '-Wl,-R,%s'

    # check for rpath
    if conf.CHECK_LIBRARY_SUPPORT(rpath=True):
        support_rpath = True
        conf.env.RPATH_ON_BUILD   = not Options.options.disable_rpath_build
        conf.env.RPATH_ON_INSTALL = (conf.env.RPATH_ON_BUILD and
                                     not Options.options.disable_rpath_install)
        if not conf.env.PRIVATELIBDIR:
            conf.env.PRIVATELIBDIR = '%s/%s' % (conf.env.LIBDIR, Context.g_module.APPNAME)
        conf.env.RPATH_ON_INSTALL_PRIVATE = (
            not Options.options.disable_rpath_private_install)
    else:
        support_rpath = False
        conf.env.RPATH_ON_INSTALL = False
        conf.env.RPATH_ON_BUILD   = False
        conf.env.RPATH_ON_INSTALL_PRIVATE = False
        if not conf.env.PRIVATELIBDIR:
            # rpath is not possible so there is no sense in having a
            # private library directory by default.
            # the user can of course always override it.
            conf.env.PRIVATELIBDIR = conf.env.LIBDIR

    if (not Options.options.disable_symbol_versions and
        conf.CHECK_LIBRARY_SUPPORT(rpath=support_rpath,
                                   version_script=True,
                                   msg='-Wl,--version-script support')):
        conf.env.HAVE_LD_VERSION_SCRIPT = True
    else:
        conf.env.HAVE_LD_VERSION_SCRIPT = False

    if conf.CHECK_CFLAGS(['-fvisibility=hidden']):
        conf.env.VISIBILITY_CFLAGS = '-fvisibility=hidden'
        conf.CHECK_CODE('''int main(void) { return 0; }
                           __attribute__((visibility("default"))) void vis_foo2(void) {}\n''',
                        cflags=conf.env.VISIBILITY_CFLAGS,
                        strict=True,
                        define='HAVE_VISIBILITY_ATTR', addmain=False)

    # check HAVE_CONSTRUCTOR_ATTRIBUTE
    conf.CHECK_CODE('''
            void test_constructor_attribute(void) __attribute__ ((constructor));

            void test_constructor_attribute(void)
            {
                return;
            }

            int main(void) {
                return 0;
            }
            ''',
            'HAVE_CONSTRUCTOR_ATTRIBUTE',
            addmain=False,
            strict=True,
            msg='Checking for library constructor support')

        # check HAVE_DESTRUCTOR_ATTRIBUTE
    conf.CHECK_CODE('''
            void test_destructor_attribute(void) __attribute__ ((destructor));

            void test_destructor_attribute(void)
            {
                return;
            }

            int main(void) {
                return 0;
            }
            ''',
            'HAVE_DESTRUCTOR_ATTRIBUTE',
            addmain=False,
            strict=True,
            msg='Checking for library destructor support')

    conf.CHECK_CODE('''
            void test_attribute(void) __attribute__ (());

            void test_attribute(void)
            {
                return;
            }

            int main(void) {
                return 0;
            }
            ''',
            'HAVE___ATTRIBUTE__',
            addmain=False,
            strict=True,
            msg='Checking for __attribute__')

    if sys.platform.startswith('aix'):
        conf.DEFINE('_ALL_SOURCE', 1, add_to_cflags=True)
        # Might not be needed if ALL_SOURCE is defined
        # conf.DEFINE('_XOPEN_SOURCE', 600, add_to_cflags=True)

    # we should use the PIC options in waf instead
    # Some compilo didn't support -fPIC but just print a warning
    if conf.env['COMPILER_CC'] == "suncc":
        conf.ADD_CFLAGS('-KPIC', testflags=True)
        # we really want define here as we need to have this
        # define even during the tests otherwise detection of
        # boolean is broken
        conf.DEFINE('_STDC_C99', 1, add_to_cflags=True)
        conf.DEFINE('_XPG6', 1, add_to_cflags=True)
    else:
        conf.ADD_CFLAGS('-fPIC', testflags=True)

    # On Solaris 8 with suncc (at least) the flags for the linker to define the name of the
    # library are not always working (if the command line is very very long and with a lot
    # files)

    if conf.env['COMPILER_CC'] == "suncc":
        save = conf.env['SONAME_ST']
        conf.env['SONAME_ST'] = '-Wl,-h,%s'
        if not conf.CHECK_SHLIB_INTRASINC_NAME_FLAGS("Checking if flags %s are ok" % conf.env['SONAME_ST']):
            conf.env['SONAME_ST'] = save

    conf.CHECK_INLINE()

    # check for pkgconfig
    conf.CHECK_CFG(atleast_pkgconfig_version='0.0.0')

    conf.DEFINE('_GNU_SOURCE', 1, add_to_cflags=True)
    conf.DEFINE('_XOPEN_SOURCE_EXTENDED', 1, add_to_cflags=True)

    #
    # Needs to be defined before std*.h and string*.h are included
    # As Python.h already brings string.h we need it in CFLAGS.
    # See memset_s() details here:
    # https://en.cppreference.com/w/c/string/byte/memset
    #
    if conf.CHECK_CFLAGS(['-D__STDC_WANT_LIB_EXT1__=1']):
        conf.ADD_CFLAGS('-D__STDC_WANT_LIB_EXT1__=1')

    # on Tru64 certain features are only available with _OSF_SOURCE set to 1
    # and _XOPEN_SOURCE set to 600
    if conf.env['SYSTEM_UNAME_SYSNAME'] == 'OSF1':
        conf.DEFINE('_OSF_SOURCE', 1, add_to_cflags=True)
        conf.DEFINE('_XOPEN_SOURCE', 600, add_to_cflags=True)

    # SCM_RIGHTS is only avail if _XOPEN_SOURCE iѕ defined on IRIX
    if conf.env['SYSTEM_UNAME_SYSNAME'] == 'IRIX':
        conf.DEFINE('_XOPEN_SOURCE', 600, add_to_cflags=True)
        conf.DEFINE('_BSD_TYPES', 1, add_to_cflags=True)

    # Try to find the right extra flags for C99 initialisers
    for f in ["", "-AC99", "-qlanglvl=extc99", "-qlanglvl=stdc99", "-c99"]:
        if conf.CHECK_CFLAGS([f], '''
struct foo {int x;char y;};
struct foo bar = { .y = 'X', .x = 1 };
'''):
            if f != "":
                conf.ADD_CFLAGS(f)
            break

    # get the base headers we'll use for the rest of the tests
    conf.CHECK_HEADERS('stdio.h sys/types.h sys/stat.h stdlib.h stddef.h memory.h string.h',
                       add_headers=True)
    conf.CHECK_HEADERS('strings.h inttypes.h stdint.h unistd.h minix/config.h', add_headers=True)
    conf.CHECK_HEADERS('ctype.h', add_headers=True)

    if sys.platform != 'darwin':
        conf.CHECK_HEADERS('standards.h', add_headers=True)

    conf.CHECK_HEADERS('stdbool.h stdint.h stdarg.h vararg.h', add_headers=True)
    conf.CHECK_HEADERS('limits.h assert.h')

    # see if we need special largefile flags
    if not conf.CHECK_LARGEFILE():
        raise Errors.WafError('Samba requires large file support support, but not available on this platform: sizeof(off_t) < 8')

    if conf.env.HAVE_STDDEF_H and conf.env.HAVE_STDLIB_H:
        conf.DEFINE('STDC_HEADERS', 1)

    conf.CHECK_HEADERS('sys/time.h time.h', together=True)

    if conf.env.HAVE_SYS_TIME_H and conf.env.HAVE_TIME_H:
        conf.DEFINE('TIME_WITH_SYS_TIME', 1)

    # cope with different extensions for libraries
    (root, ext) = os.path.splitext(conf.env.cshlib_PATTERN)
    if ext[0] == '.':
        conf.define('SHLIBEXT', ext[1:], quote=True)
    else:
        conf.define('SHLIBEXT', "so", quote=True)

    # First try a header check for cross-compile friendlyness
    conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
                        #define B __BYTE_ORDER
                        #elif defined(BYTE_ORDER)
                        #define B BYTE_ORDER
                        #endif

                        #ifdef __LITTLE_ENDIAN
                        #define LITTLE __LITTLE_ENDIAN
                        #elif defined(LITTLE_ENDIAN)
                        #define LITTLE LITTLE_ENDIAN
                        #endif

                        #if !defined(LITTLE) || !defined(B) || LITTLE != B
                        #error Not little endian.
                        #endif
                        int main(void) { return 0; }\n""",
                            addmain=False,
                            headers="endian.h sys/endian.h",
                            define="HAVE_LITTLE_ENDIAN")
    conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
                        #define B __BYTE_ORDER
                        #elif defined(BYTE_ORDER)
                        #define B BYTE_ORDER
                        #endif

                        #ifdef __BIG_ENDIAN
                        #define BIG __BIG_ENDIAN
                        #elif defined(BIG_ENDIAN)
                        #define BIG BIG_ENDIAN
                        #endif

                        #if !defined(BIG) || !defined(B) || BIG != B
                        #error Not big endian.
                        #endif
                        int main(void) { return 0; }\n""",
                            addmain=False,
                            headers="endian.h sys/endian.h",
                            define="HAVE_BIG_ENDIAN")

    if not conf.CONFIG_SET("HAVE_BIG_ENDIAN") and not conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
        # That didn't work!  Do runtime test.
        conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
            u.i = 0x01020304;
            return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;""",
                          addmain=True, execute=True,
                          define='HAVE_LITTLE_ENDIAN',
                          msg="Checking for HAVE_LITTLE_ENDIAN - runtime")
        conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
            u.i = 0x01020304;
            return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;""",
                          addmain=True, execute=True,
                          define='HAVE_BIG_ENDIAN',
                          msg="Checking for HAVE_BIG_ENDIAN - runtime")

    # Extra sanity check.
    if conf.CONFIG_SET("HAVE_BIG_ENDIAN") == conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
        Logs.error("Failed endian determination.  The PDP-11 is back?")
        sys.exit(1)
    else:
        if conf.CONFIG_SET("HAVE_BIG_ENDIAN"):
            conf.DEFINE('WORDS_BIGENDIAN', 1)

    # check if signal() takes a void function
    if conf.CHECK_CODE('return *(signal (0, 0)) (0) == 1',
                       define='RETSIGTYPE_INT',
                       execute=False,
                       headers='signal.h',
                       msg='Checking if signal handlers return int'):
        conf.DEFINE('RETSIGTYPE', 'int')
    else:
        conf.DEFINE('RETSIGTYPE', 'void')

    conf.CHECK_VARIABLE('__FUNCTION__', define='HAVE_FUNCTION_MACRO')

    conf.CHECK_CODE('va_list ap1,ap2; va_copy(ap1,ap2)',
                    define="HAVE_VA_COPY",
                    msg="Checking for va_copy")

    conf.CHECK_CODE('''
                    #define eprintf(...) fprintf(stderr, __VA_ARGS__)
                    eprintf("bla", "bar")
                    ''', define='HAVE__VA_ARGS__MACRO')

    conf.env.enable_libfuzzer = Options.options.enable_libfuzzer
    if conf.env.enable_libfuzzer:
        conf.DEFINE('ENABLE_LIBFUZZER', 1)

    conf.load('clang_compilation_database')

    # Create a symlink of the compile db for clangd
    symlink(os.path.join(conf.bldnode.abspath(), 'default/compile_commands.json'),
            os.path.join(conf.srcnode.abspath(), 'compile_commands.json'),
            force=True)

    conf.SAMBA_BUILD_ENV()


def build(bld):
    # give a more useful message if the source directory has moved
    curdir = bld.path.abspath()
    srcdir = bld.srcnode.abspath()
    relpath = os.path.relpath(curdir, srcdir)
    if relpath.find('../') != -1:
        Logs.error('bld.path %s is not a child of %s' % (curdir, srcdir))
        raise Errors.WafError('''The top source directory has moved. Please run distclean and reconfigure''')

    bld.SETUP_BUILD_GROUPS()
    bld.ENFORCE_GROUP_ORDERING()
    bld.CHECK_PROJECT_RULES()
